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Rag Chew => Off Topic Discussions => Topic started by: ralph day on November 08, 2019, 08:20:57 AM

Title: back to "what is this"
Post by: ralph day on November 08, 2019, 08:20:57 AM
Ok, is this for real?  In an inverter?  Am I showing my ignorance?  And what is it?

Title: Re: back to "what is this"
Post by: boB on November 08, 2019, 01:22:55 PM

Ross may pipe up and say where he got a pic of that but it is some kind of transmitting tube.
Air cooled I think ?

The big round top (upside down) is the plate for pretty sure and the bottom (right side up) ring might be a connection ?

If  this is a directly heated cathode triode tube then the 3 wires sticking out the bottom would be heater-cathode, heater-cathode and grid.

boB
Title: Re: back to "what is this"
Post by: RossW on November 08, 2019, 03:14:28 PM

Ross may pipe up and say where he got a pic of that but it is some kind of transmitting tube.
Air cooled I think ?

Indeed it is from a (now old) commercial AM transmitter. This valve produced a couple of kilowatts of carrier, and another hefty valve amplified the modulation which was then superimposed via modulation transformer.

Quote
The big round top (upside down) is the plate for pretty sure and the bottom (right side up) ring might be a connection ?

If  this is a directly heated cathode triode tube then the 3 wires sticking out the bottom would be heater-cathode, heater-cathode and grid.

(http://bits.rossw.net/valves/5762/100_3050.JPG)

There is an interesting section on the valve and its manufacture here https://frank.pocnet.net/other/AWV_Radiotronics/Radiotronics_1958/1958_03_AWV_Radiotronics_23_03.pdf (https://frank.pocnet.net/other/AWV_Radiotronics/Radiotronics_1958/1958_03_AWV_Radiotronics_23_03.pdf)

I understand the Radiotron 5762 was typically used in a grounded-grid configuration.